Studies after missing start of course (3)

I believe the answer is:

yes

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'of course' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for yes that I've seen before include "Absolutely" , "That's 27 [RIGHT]" , "Certainly!" , "Positive reply" , "Pro vote" .)

I've seen this clue in The Times.

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